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Printed solar has been around for many many years, people have hopes that the cheap cost will out weigh the draw backs of it like it's lower efficiency, and shorter lifespan.
Spend slightly more and you can buy what is currently available and you will get a 25-30 warranty with a life span of 50+ years (real world testing starting back before the 1960's), I don't trust alot of these "printed solar" companies, because they try to wow the public with big words and vague descriptions and "secrets" but you can go to Google patents and look at their patented proses and suddenly it's not as impressive.
Solar hot water works too, if you have alot of time you can do it cheap, but stuff like this is not alwas the best thing to skimp on, if your discounted pump or sensor or pressure relive valve stops working, your hot water panel can turn that water to steam in a matter of minutes and send boiling water spraying causing damage or burning anyone that is close to it.
If you want to do this, check out Home Power Magazine, get their CD of back issues, read their solar hot water buyers guide.
If you want cheap easy solar hot water lay a dark hose in your driveway.
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